I've had another look at this and it's an almost guaranteed win at the tribunal. Just make a representation as follows:
Dear London Borough of Islington,
I require you to consider my informal representations as my formal representations.
Yours faithfully,
Send this online and keep a screenshot of the confirmation page once submitted.
@Usiaw this is an interesting case, as the road is a GLA Road, as show by the double red lines either side of the parking bays: https://maps.app.goo.gl/JQmLA6uSqPq15knc6
Item 2 on page 45 of the schedule to The GLA Roads (No.3) Designation Order 2008 (https://drive.google.com/file/d/1dmzc0AJXf0tw_JL5aRpLNt5nO-dbq-St/view) provides as follows:
A1 (HOLLOWAY ROAD, HIGHBURY CORNER AND RDBT., UPPER STREET, ISLINGTON HIGH STREET, GOSWELL ROAD), both sides from the Archway gyratory to the south-east side of.its junction with Goswell Road and Wakley Street
There is no exclusion for any parking bays falling within the council's remit, so this is a GLA road in its entirety.
Here is a draft representation:
Dear London Borough of Islington,
Upper Street is designated as a GLA road by the item 2 on page 45 of the schedule to The GLA Roads (No.3) Designation Order 2008. It follows that the highway authority at this location is Transport for London and not the London Borough of Islington.
Article 3(4) of The Islington (Charged-For Parking Places) Order (Consolidation) 2023 provides that:
"The designations and provisions imposed by this Order do not apply to any street or length of street which is part of the Transport for London Road Network."
It follows that the contravention alleged did not occur and the PCN must be cancelled.
Yours faithfully,
Send this online via https://islington.tarantoportal.com/ and make sure to keep a screenshot of the confirmation page. If you want to see Islington's traffic order a copy is here (https://drive.google.com/file/d/1hGdq17OtTcGnqJRzcIitHovRenHEiY6K/view), the map tile for this location is on page 595.
Don't worry if the council issues a rejection, it is highly unlikely they will understand the representation but that really doesn't matter.